Most of today's vehicles feature four-channel ABS systems, which enable the brake pressure to be controlled separately at each wheel. Systems of this type control the front wheels separately and the rear wheels are jointly. In the past, three-channel anti-lock systems were the most popular.
The intelligent ABS system regulates the brake force so that the slip at each wheel remains within the optimum range and individual wheels do not lock at the same time.
#Anti lock braking system definition drivers#
Even experienced drivers will find it difficult to reach this narrow, optimum range they will not be able to reach it at all in extreme circumstances. With modern tyres and "standard road surfaces", optimum braking deceleration is reached at a brake slip of between approximately 8 and 25%. If the driver presses the brake pedal even harder, the wheel will lock. The rolling circumference of the tyre is less than the distance the vehicle is covering. When the driver presses hard on the brake pedal, the tyres initially switch from their normal rolling motion to what is known as the brake slip range. The German road traffic registration ordinance (StVZO) also uses the abbreviation ABV, which stands for anti-lock braking system. This is achieved by repeatedly and intelligently reducing and increasing the brake pressure, a procedure known as pressure modulation. The task of the anti-lock brake system (ABS) is to permanently and effectively stop the wheels from locking, thereby stabilising braking. If the wheels lock when the brakes are fully applied, the ability to steer is lost and the vehicle can become uncontrollable.
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